Shenavaaei app represents many usefull informations about this topics:

- Hearing

- Hearing loss and causes

- Speech learning milestones in children

- Hearing aid

- Cochlear implant 

- Hearing protection

and many audiology clinic addresses to facilitate finding these centers.

materials of app from reference books (HOCA, Audiology Diagnosis) and famous websites like hearing review, ASHA and Mayo clinic.